Both glucose and the appropriate enzymes are necessary for glycolysis to begin. Which additional compound must also be present?
Correct answer: B. ATP
- A. Acetyl coenzyme A
- B. ATP
- C. Pyruvate
- D. Reduced NAD
Explanation
The correct answer is ATP. During glycolysis, ATP is initially consumed to provide the energy needed to start the breakdown of glucose. This is crucial for the phosphorylation steps that convert glucose into pyruvate. Acetyl-CoA is involved later in the metabolic pathway, specifically in the citric acid cycle. Pyruvate is the end product of glycolysis, not a starting compound. Reduced NAD (NADH) is generated during glycolysis but is not needed to initiate the process.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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